One way is to repair the operating system, you will need the XP install disk
the directions are posted in this forum, fourth post from the top
hopefully you will have or borrow a disk, because this is the most reliable method
Step 1: When the Setup is inspecting your computer’s hardware configuration message is displayed during Windows XP setup press F5. When prompted, provide appropriate information about your PC and hardware abstraction layer (HAL). For a single processor PC, you need to specify this information as “Standard PC” HAL.
Step 2: Restart your system and open the BIOS settings page. Here, turn off the following settings:
* Plug and Play
* BIOS-based virus protection feature
* All caching configuration including BIOS, L2, Internal/External and writeback caching of disk controllers.
Step 3: Disconnect all hardware devices and adapters that are not essential to install Windows XP on the PC. These include:
* Network and Sound adapters
* Internal Modem
* Additional hard disks
* CD/DVD drives-if you are not using them to install Windows
Step 4: In case a SCSI adaptor is installed on your system, do the following:
* Contact the adapter manufacturer or vendor for the latest drivers for the adapter.
* Disable sync negotiation for the SCSI controller.
* Ensure that the termination and IDs of all SCSI devices on your PC are in place.
* Except for the hard disk on which or from which you are running the installation, disable all SCSI devices that are not essential for Windows to be functional.
Step 5: In case an IDE adaptor is installed on your system, do the following:
* Configure the IDE port that is on the motherboard to Primary Only.
* Ensure that all IDE devices are appropriately configured as Master/Salve/Only.
* Except for the hard disk on which or from which you are running the installation, disable all IDE devices that are not essential for Windows to be functional.
Step 6: Check the system memory.
* Ensure that all memory chips on your system are of the same configuration and run at the same speed.
* Run memory tests to ensure that all memory chips are working fine.
* Try to use different chips to test problems with memory chips on the system.
Step 7: Ensure that there is no problem with your motherboard.
* Check with your motherboard manufacturer to ensure that there are no compatibility issues with Windows XP.
* Run diagnostics tool to check problems with the motherboard.
* If an update is available, update the BIOS of your system BIOS.
Steps to Troubleshoot Stop 0x0A error message when Windows XP is already running
The following are some of the tasks that you can perform to recover from the Stop 0x0000000A error when your Windows XP is functional:
1. Uninstall or disable any third-party drivers or software on the PC.
2. Restart your PC, press F8 before the Windows XP screen is displayed, and then select the option to start your PC in Last Known Good Configuration.
3. Repair your Windows XP installation by using the Windows XP installation CD.
4. Update the drivers of the hardware installed on your system.
5. Check Event Viewer for any message that might indicate the cause of the error.
6. Repair and clean your registry with the help of a reliable registry cleaner tool, such as RegGenie.
Driver Update: Many errors are related to driver problems such as obsolete, outdated or incompatible drivers. A driver update tool is recommended to scan your system for corrupted and outdated drivers and to ensure that all your drivers stay up-to-date.